Do you have a macbook and need a proxy at work and not at home? Don’t you wish there was a way to automatically switch from one network location to another based on what SSID you were connected to? That way you can open your macbook and it will just work. I have one that works for me. It requires “sleepwatcher” and growlnotify (from the Extras/ folder in a Growl dmg).
Download it from here:
http://www.drqware.com/downloads/updatelocation.tgz
Check it out!